Filter



E. DE s'ruBN FILTER Flled Aug 18 1923 March 8, 1927- INVENTOR.

Patented Mar. 8, 1927.

UNITED STATES EMILE DE STUBNER, OF NEW YORK, N. Y.

FILTER.

Application filed August 18, 1923. Serial No. 658,024.

This invention relates to filters and has for its object the mounting of the filtering fabric in such manner that the liquid being filtered will be prevented from finding its a Way beneath the filtering fabric and thereby escaping without being subjected to the filtering action.

The invention is designed with specia reference to the support of the filtering !o fabric over a permeable bed in a filtering vessel, although the invention is not limited to such special application; and the invention consists of a filtering unit comprising a holding frame of improved form for the filtering fabric, and a filtering fabric fastened in an improved manner to said frame.

The invention consists also in the combination with a filtering vessel having a supporting portion therein, such for instance as a permeable bed, of a filtering unit-suported within the vessel and comprising a rame and a filtering fabric fastened at its edge to the frame and extending over and across the permeable bed.

The invention consists also in providing the filtering, unit with a handle or handles by means of which it may be inserted in plafize in the vessel or removed therefrom at w1 The invention consists also in the details of construction and combination of parts hereinafter described and claimed.

Fig. 1 is a vertical section through a filterin vessel having my invention embodied therein.

Fig. 2 is a top plan view of the same. Fig. 3 is a vertical section on an enlarged scale on the line 3, 3 of Fig. 2.

Fig. 4 is a side elevation, partly in section, of the improved filtering unit.

Fig. 5 is a vertical section through one side of a filtering unit in modified form. I 'Referring particularly to Fig. 4., my improved filtering unit comprises an open an 4 nular frame 1 and a filtering fabric 2 extending across the open portion of the frame and fastened at its edge to the same. This frame in the present instance consists of a base ring 3 formed in its upper side with an annular cavity 4, and a clamping ring 5 which seats in the cavity, the edge of the filtering fabric being extended in the cavity and between the meeting faces of the two rings and bein firmly clamped in place thereby. In 51c present instance, the

eyes 6, these rods thus constituting handles clampingring is held down on the base ring to confine the edge of the fabric, by'means of two clamping devices in the form of rods 6 whose lower ends are reduced to form studs 7, and shoulders 8 at the junction of the studs with the enlarged portions of the rods. The studs extend through aligned holes in the two rings, and the extremities of the studs are threaded and screwed in threaded holes in the base ring, with the shoulders bearing against the upper side of the clamping ring; whereby by screwing up the rods, the clamping ring will be forced tightly against the base ring and will clamp and confine the edge of the filtering fabric between them. These rods are extended ,axially from the ring and serve as handlesforthe purpose presently to be described.

Referring torFig's. 1,2 and 3, which illustrate the use of the filtering unit in a filtermg vessel, 9 designates a vessel having a supporting portion 10 therein, which sup porting portion is, in this instance, in the form of a permeable bed which divides the vessel into an upper compartment 11 to receive the liquid to be filtered, and a lower compartment 12 to receive the filtered liquid.

This bed is formed at its outer portion with an annular cavity 13 in which seats the annular frame 1 of the filtering unit, the relation of the depth of the cavity to the height of the frame being such, that, with the frame so seated, the filtering fabric will extend across and will closely overlie and cover the permeable bed. The rods 6 extend upwardly 9o along the wall of the vessel in semi-circular grooves 9 formed in said wall and the rods terminate at their upper ends above the top of the vessel where. they are provided with by means of which the filtering unit may be inserted in place in the vessel or removedtherefrom as occasion may demand.

Due to the construction'of my improved filtering unit as illustrated and described, and to the manner of supporting the same relative to the permeable bed, it will be seen loo that the liquid in the compartment 11 to be filtered cannot find its way beneath the filterin fabric and escape without being subjecte to the filtering action. The edge of the fabric being firmly clamped and confined between the two rings of the holding frame, the fabric cannot be lifted or forced up wardly and permit the escape of the liquid from above. Any liquid which might find its way around .the outer edge of the frame and between the same and the wallof the vessel, will be prevented from working in under the filtering fabric by reason of the engagement of the fiat under face of the base ring with the fiat bottom of the cavity in the bed, which surfaces are held in close fluid-sealed contact with each other by the weight of the body of liquid above, and by the suction beneath when employed in con nection with a vacuum filter.

It will of course be understood that the parts of the filtering unit will be assembled outside of the filtering vessel, and the unit lowered into the vessel and inserted in the cavity in the permeable bed through the medium of the handles, as before described.

As shown in Fig. 5, the wall of the annular cavity in the base ring of the frame 1 is formed on a slope or incline, as shown at 14, and the inner edge of the clamping ring is correspondingly shaped to cooperate with said wall so as to bring about a wedging action of the parts on the edge of the filtering fabric.

In the foregoing description and the ac companying drawings, I have set. forth my invention in the particular detailed form and construction which I prefer to adopt. It will be manifest, however, that the invention is not limited to these details and the latter may be variously changed and modified without departing-from the spirit of the invention. that the invention is not limited to any particular form or construction of the parts And it will be understood.

except in so far as such limitations are specified in the claims. c.

Having thus described my invention, what rings and acting to clamp the rings together, and extending upwardly to serve as handles.

3. A filtering unit for filters, comprising a base ring provided with a cavity formed with an annular wall sloping outwardly and downwardly,- a clamping rin adapted to seat in the cavity and having its inner edge sloped downwardly and outwardly to cooperate with the sloping wall of the cavity, a filtering fabric extending across the ring and having its edge seated betweenthe sloping portions of the two rings, and means for clamping the rings together to confine the edge of the fabric; whereby the rings when clamped will act with a wedging effect and thereby tightly confine the edge of the fabric.

In testimony whereof, I have aflixed my signature hereto.

EMILE DE STUBNER. 

